Installing and Upgrading Fans in Cisco 2811 Series Routers

This document describes how to install or upgrade fans that are located internally within a Cisco 2811 series integrated services router. You need to remove the cover from the router to install or remove any of these items. The document contains the following sections:

Safety Warnings

Warning This equipment must be grounded. Never defeat the ground conductor or operate the equipment in the absence of a suitably installed ground conductor. Contact the appropriate electrical inspection authority or an electrician if you are uncertain that suitable grounding is available. Statement 1024

Warning Only trained and qualified personnel should be allowed to install, replace, or service this equipment. Statement 1030

Warning Before working on a system that has an on/off switch, turn OFF the power and unplug the power cord. Statement 1

Warning Do not work on the system or connect or disconnect cables during periods of lightning activity. Statement 1001

Warning Read the installation instructions before connecting the system to the power source. Statement 1004

Warning Before working on equipment that is connected to power lines, remove jewelry (including rings, necklaces, and watches). Metal objects will heat up when connected to power and ground and can cause serious burns or weld the metal object to the terminals. Statement 43

Warning Hazardous network voltages are present in WAN ports regardless of whether power to the unit is OFF or ON. To avoid electric shock, use caution when working near WAN ports. When detaching cables, detach the end away from the unit first. Statement 1026

Removing the Chassis Cover

Cisco 2811 series routers have a cover that lifts off after you slide it free from front panel.

Caution Do not, under any circumstances, tamper with or attempt to remove the safety shields protecting the WIC/HWIC slots and connectors on the Cisco 2811 routers.

Removing the Cover from Cisco 2811 Routers

To remove the chassis cover for a Cisco 2811 series router, follow these steps. You will need a number 2 Phillips screwdriver and a flat-blade screwdriver with a blade width of 1/4 ± 1/32 inch (5 to 7 mm). Rack-mounted routers must be removed from the rack and positioned on a flat surface before you start removing the cover.

Caution To prevent damage to the chassis, follow this procedure to remove the cover. Do not pry on the plastic bezel or on the ears at either side of the chassis on the back.

The following warning applies only if the router is provided with a DC power input:

Warning Before performing any of the following procedures, ensure that power is removed from the DC circuit. Statement 1003

Step 1 Make sure that the router is turned off and disconnected from its power source.

Step 2 If rack-mounting brackets are attached to the chassis, remove them, using a Phillips screwdriver.

Step 3 Remove the four screws at the back of the top cover, using a Phillips screwdriver.

Step 4 Perform the following steps to loosen the cover from the chassis:

a. Insert the blade of the 1/4-inch screwdriver straight into the square hole on either side of the chassis near the back, so that it fits against the chassis and does not go past the chassis and into the narrow slot. See Figure 1.

Caution Make sure that the tip of the screwdriver does
not slide into the narrow vertical slot that is visible inside the square hole. The tip of the screwdriver should rest on the metal tab just inside the chassis cover and to the right of the vertical slot.

Figure 1 Inserting the Screwdriver into the Side of the Chassis

b. With the screwdriver positioned as required in Stepa. above, rotate the screwdriver a quarter turn toward the back of the chassis to loosen one side of the cover. See Figure 2.

Caution The friction fit may be fairly tight; however, if the cover does not move with moderate effort, make sure that the screwdriver is
not inserted into the narrow vertical slot.

Caution When you remove or install a fan, always wear an ESD-preventive wrist strap, and ensure that it makes good contact with your skin. Connect the equipment end of the wrist strap to the metal part of the chassis.

Removing the System Fans

To remove a system fan, perform the following procedure. To complete this procedure, you may need a flat-blade screwdriver.

Step 1 Locate the fans to be removed. See Figure 4 for the location of the fans.

Step 2 Disconnect the fan connector from the system board as shown in Figure 5.

Figure 5 Disconnecting the System Fan Connector from the System Board

Step 3 Remove the fan wire from the wire management clip, which is located on the chassis base as shown in Figure 6.

Figure 6 Removing the Fan Wire from the Wire Management Clip

Step 4 Remove the fan by sliding it upward, and then tilting it toward the chassis wall as shown in Figure 8.

Note If the fan is difficult to grasp when sliding upward, use a flat-blade driver for leverage as shown in Figure 7.

Figure 7 Using a Flat-Blade Screwdriver for Added Leverage When Removing the Fan

Figure 8 shows the fan being tilted away from the chassis to remove it.

Figure 8 Lifting and Tilting the Fan to Remove

1

Lift the fan upward

2

Tilt the fan toward chassis

Step 5 Place the fan in an antistatic bag to protect it from ESD damage.

Removing the Power Supply Fan

To remove the power supply fan, perform the following procedure. To complete this procedure, you may need a flat-blade screwdriver.

Step 1 Locate the fan to be removed. See Figure 4 for the location of the fans.

Step 2 Disconnect the fan connector from the system board as shown in Figure 9.

Figure 9 Disconnecting the Power Supply Fan Connector

Step 3 Lift the ribbon cable to allow slack to remove the air baffle as shown in Figure 10.

Note It is not necessary to disconnect the ribbon cable from the CompactFlash printed circuit board (PCB) or system board.

Figure 10 Lifting the Ribbon Cable

Step 4 Remove the plastic air baffle by gently squeezing the air baffle sides, disengaging the baffle from the chassis base as shown in Figure 11.

Figure 11 Removing the Air Baffle

Step 5 Remove the fan wire from the wire management clip, which is located on the chassis base as shown in Figure 6.

Step 6 Remove the fan by placing a flat-blade screwdriver at the base of the plastic fan housing and lifting the fan in a vertical position, as shown in Figure 12.

Figure 12 Using a Flat-Blade Screwdriver to Lift the Fan

Step 7 Disengage the fan from the side attachment slots and push the fan toward the center of the chassis, and remove the fan as shown in Figure 13.

Figure 13 Disengaging the Fan from the Side Attachment Slots

Step 8 Place the fan in an antistatic bag to protect it from ESD damage.

Installing the Fans

To install the system and power supply fans, perform the following procedure:

Step 1 Locate the fan slot. See Figure 4 for the location of the fans.

Note The fans have side attachment slots that are used to guide the fan into place. See Figure 16.

Figure 14 Positioning the Fan

1

Tabs

Caution Verify that the side attachment slots are not bent out of position when you instal the fan. Misaligned side attachment slots will not properly secure the fan when in position.

Step 2 Insert the fan in the side attachment slots (as shown in Figure 16), and slide the fan down over the locking tabs at the chassis base as shown in Figure 17.

Figure 15 Inserting the Fan

1

Side attachment slots

Figure 16 Fan Inserted

Step 3 Angle the fan into the locking tabs, and verify that the fan has snapped into the locking tabs as shown in Figure 17.

Figure 17 Angling the Fan Into the Locking Tabs

Note When the fan is properly seated, the top and bottom of the fan should be flush against the chassis wall.

Step 4 Thread the fan wire under the wire management feature at the chassis base as shown in Figure 6.

Step 5 Attach the fan connector to the system board.

Step 6 (Power supply fan only) Install the plastic air baffle below the ribbon cable, and secure the plastic tabs onto the chassis base. Gently squeeze the baffle so that the four bottom hooks can snap into the sheet metal hold-downs.